hello all, im replacing some shells on the bottom, what tool do i need to measure the crankshaft journals? ive got my 5digit number off the bottom of the block that relates to the specific shells and got the number off the back of the shell now im told to measure the journals so they can identify the correct ones as theres around ten diff one,s for my year car

thanks
andy

 

the bearing should say if they std or .25 .5